The 2003 Primera División de Chile season was both 73rd and 74th season of top-flight football in Chile.
The 2003 Campeonato Nacional Apertura Copa Banco del Estado was the 73rd Chilean League top flight tournament, in which Cobreloa won its sixth league title after eight years.
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Santiago Wanderers qualify to playoffs as best placed team despite having drawn with Unión San Felipe.
Colo-Colo and Huachipato qualified as best losers.
All sixteen first level teams took part in this tournament, plus -and only for this edition-, all sixteen second level teams took part as well. One of the qualified teams to the Copa Sudamericana coming from this division, Provincial Osorno.
Played on July 9 & 10, 2003
Played on July 13, 2003
Played on July 16 & 17, 2003
<small>Universidad Católica & Provincial Osorno qualified to 2003 Copa Sudamericana</small>
The 2003 Campeonato Nacional Clausura Copa Banco del Estado was the 74th Chilean League top flight tournament, in which Cobreloa won its seventh league title after beating Colo-Colo in the finals.
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Santiago Wanderers and Palestino qualified as best losers.